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公开(公告)号：US20200186927A1
公开(公告)日：2020-06-11
申请号：US16709075
申请日：2019-12-10
Inventor： John Paul LESSO , Mark James MCCLOY-STEVENS , John Bruce BOWLERWELL , Yanto SURYONO , Xin ZHAO , Morgan Timothy PRIOR
Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.
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2.发明申请公开(公告)号：US20200044616A1
公开(公告)日：2020-02-06
申请号：US16190427
申请日：2018-11-14
Inventor： Tejasvi DAS , Eric J. KING , Xin ZHAO , Xiaofan FEI , Johann G. GABORIAU , Lei ZHU , John L. MELANSON , Thomas HOFF
Abstract: A system may include a digital modulator configured to modulate an input signal received at an input of the digital modulator to generate a modulated input signal at an output of the digital modulator, a digital gain element having a digital gain and coupled to the digital modulator, an open-loop Class-D amplifier coupled to an output of the digital modulator and configured to amplify the modulated input signal, wherein the open-loop Class-D amplifier is powered from a variable power supply having a variable supply voltage which is variable in response to one or more characteristics of the input signal, and a control circuit configured to control the digital gain to approximately cancel changes in an analog gain of the open-loop Class-D amplifier due to variation in the variable supply voltage in response to the one or more characteristics of the input signal.
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公开(公告)号：US20180159488A1
公开(公告)日：2018-06-07
申请号：US15884912
申请日：2018-01-31
Inventor： Xin ZHAO , Tejasvi DAS , Xiaofan FEI , Alan Mark MORTON
CPC classification number: H03F3/2171 , H03F1/32 , H03F1/342 , H03F3/181 , H03F3/187 , H03F3/217 , H03F3/2173 , H03F3/38 , H03F3/72 , H03F2200/345 , H03F2200/351
Abstract: An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. Structure of the feedback network and the first stage may remain static when switching between modes.
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4.发明公开公开(公告)号：US20230379592A1
公开(公告)日：2023-11-23
申请号：US18318896
申请日：2023-05-17
Inventor： Wai-Shun SHUM , Amar VELLANKI , Jeffrey SKARZYNSKI , Gautham S. SIVASANKAR , Xingdong DAI , Venugopal CHOUKINISHI , Xiaofan FEI , Xin ZHAO
IPC: H04N23/90
CPC classification number: H04N23/90
Abstract: A system for relaying communication for a PHY/data link level communication protocol may include a first device having a first and second transceiver, the first transceiver having a first protocol controller configured to detect a first bus condition and second transceiver having a second protocol controller configured to detect a second bus condition and a switching matrix coupled to the first and second transceiver and configured to operate in a relaying mode to enable: the first protocol controller to control a physical layer of the second transceiver and enables the second protocol controller to control a physical layer of the first transceiver, a physical layer of a first transmitter of the first transceiver to receive an output of a second receiver of the second transceiver, and the physical layer of a second transmitter of the second transceiver to receive an output of a first receiver of the first transceiver.
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公开(公告)号：US20230082721A1
公开(公告)日：2023-03-16
申请号：US17980429
申请日：2022-11-03
Inventor： Jason L. WARDLAW , Michael A. KOST , Anthony S. DOY , Tejasvi DAS , Siddharth MARU , Xin ZHAO , Matthew BEARDSWORTH , Bruce E. DUEWER
Abstract: A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.
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Patent Agency Ranking
公开(公告)号：US20220060832A1
公开(公告)日：2022-02-24
申请号：US17516830
申请日：2021-11-02
Inventor： John Paul LESSO , Mark James MCCLOY-STEVENS , John Bruce BOWLERWELL , Yanto SURYONO , Xin ZHAO , Morgan Timothy PRIOR
Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.
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公开(公告)号：US20190115909A1
公开(公告)日：2019-04-18
申请号：US16219187
申请日：2018-12-13
Inventor： Tejasvi DAS , Alan Mark MORTON , Xin ZHAO , Lei ZHU , Xiaofan FEI , Johann G. GABORIAU , John L. MELANSON , Amar VELLANKI
CPC classification number: H03K7/08 , G06F1/025 , H02M3/157 , H02M2001/0012 , H03F3/183 , H03F3/2175
Abstract: A system may include a digital pulse width modulator subsystem, a first path coupled to an output of the digital pulse width modulator subsystem and configured to drive an open-loop driver stage, a second path coupled to the output of the digital pulse width modulator subsystem and configured to drive a closed-loop analog pulse width modulator, a controller to select between the first path and the second path for processing a signal based on one or more characteristics of the signal, and a calibration subsystem configured to calibrate at least one of a first gain of the first path and a second gain of the second path in order that the first gain and the second gain are at least approximately equal at the time of switching selection between the first path and the second path or vice versa, in order to minimize artifacts due to the switching.
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公开(公告)号：US20180295442A1
公开(公告)日：2018-10-11
申请号：US15482250
申请日：2017-04-07
Inventor： Tejasvi DAS , Xin ZHAO , Ku HE , Xiaofan FEI
CPC classification number: H04R3/00 , H03F1/0277 , H03F3/185 , H03F3/211 , H03F3/217 , H03F3/2178 , H03F3/30 , H03F3/72 , H03F2200/03 , H03F2200/411 , H03F2200/432 , H04R29/00 , H04R2420/03
Abstract: In accordance with embodiments of the present disclosure, a system may include a playback path and a control circuit. The playback path may have a playback input for receiving an input signal and configured to generate at a playback path output an output signal based on the input signal, wherein the playback path is configured to operate in a plurality of operational modes. The control circuit may be configured to receive a first signal from within the playback path and indicative of the input signal, receive a second signal generated from the input signal externally to the playback path, and select a selected operational mode from the plurality of operational modes based on the first signal and the second signal.
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公开(公告)号：US20200271706A1
公开(公告)日：2020-08-27
申请号：US16517046
申请日：2019-07-19
Inventor： Jason L. WARDLAW , Michael A. KOST , Anthony S. DOY , Tejasvi DAS , Siddharth MARU , Xin ZHAO , Matthew BEARDSWORTH , Bruce E. DUEWER
Abstract: A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.
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公开(公告)号：US20180091102A1
公开(公告)日：2018-03-29
申请号：US15277465
申请日：2016-09-27
Inventor： Xin ZHAO , Tejasvi DAS , Xiaofan FEI , Alan Mark MORTON
CPC classification number: H03F3/2171 , H03F1/32 , H03F1/342 , H03F3/181 , H03F3/187 , H03F3/217 , H03F3/2173 , H03F3/38 , H03F3/72 , H03F2200/345 , H03F2200/351
Abstract: An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. Structure of the feedback network and the first stage may remain static when switching between modes.
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